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  • Physical universe

    Physical universe

    • This piglix contains articles or sub-piglix about Physical universe

    • Energy

    • This piglix contains articles or sub-piglix about Energy


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    • Matter

    • This piglix contains articles or sub-piglix about Matter


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    • Nature

    • This piglix contains articles or sub-piglix about Nature


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    • Space

    • This piglix contains articles or sub-piglix about Space


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    • Universe

    • Universe

      The Universe is all of time and space and its contents. It includes planets, moons, minor planets, stars, galaxies, the contents of intergalactic space, and all matter and energy. The size of the entire Universe is unknown. The earliest scientific models of the Universe were developed by ancient Greek and Indian philo ... Read »


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    • Accelerating expansion of the universe

    • The accelerating expansion of the universe is the observation that the universe appears to be expanding at an increasing rate. In formal terms, this means that the cosmic scale factor a(t) has a positive second derivative, so that the velocity at which a distant galaxy is receding from the observer is continuously incr ... Read »


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    • Age of the universe

    • In physical cosmology, the age of the universe is the time elapsed since the Big Bang. The current measurement of the age of the universe is 7001137990000000000♠13.799±0.021 billion years (7010137990000000000♠(13.799±0.021)×109 years) within the Lambda-CDM concordance model. The uncertainty of 21 mil ... Read »


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    • Big Bang

    • The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution. The model accounts for the fact that the universe expanded from a very high density and high temperature state, and offers a comprehensive explanation for a broad range ... Read »


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    • Clockwork universe

    • In the history of science, the clockwork universe compares the universe to a mechanical clock. It continues ticking along, as a perfect machine, with its gears governed by the laws of physics, making every aspect of the machine predictable. This idea was very popular among deists during the Enlightenment, when Isa ... Read »


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    • Cosmic age problem

    • The cosmic age problem is a historical problem in astronomy concerning the age of the universe. The problem was that at various times in the 20th century, some objects in the universe were estimated to be older than the time elapsed since the Big Bang, as estimated from measurements of the expansion rate of the univers ... Read »


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    • Cosmic latte

    • Cosmic latte

      Cosmic Latte is a name assigned to the average color of the universe, given by a team of astronomers from Johns Hopkins University. In 2001, Karl Glazebrook and Ivan Baldry determined that the color of the universe was a greenish white, but they soon corrected their analysis in a 2002 paper, in which they reported that ... Read »


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    • Cosmogony

    • Cosmogony (or cosmogeny) is any model concerning the origin of either the cosmos or universe. Developing a complete theoretical model has implications in both the philosophy of science and epistemology. The word comes from the Koine Greek κοσμογονία (from κόσμος "cos ... Read »


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    • Cosmography

    • Cosmography is the science that maps the general features of the cosmos or universe, describing both heaven and Earth (but without encroaching on geography or astronomy). The 14th-century work 'Aja'ib al-makhluqat wa-ghara'ib al-mawjudat by Arab physician Zakariya al-Qazwini is considered to be an early work of cosmogr ... Read »


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    • Cosmology

    • Cosmology (from the Greek κόσμος, kosmos "world" and -λογία, -logia "study of") is the study of the origin, evolution, and eventual fate of the universe. Physical cosmology is the scholarly and scientific study of the origin, large-scale structures and dynamics, and ultimate fate of the ... Read »


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    • Cosmos

    • The cosmos (UK /ˈkɒzmɒs/, US /ˈkɒzmoʊs/) is the universe regarded as a complex and orderly system; the opposite of chaos. The philosopher Pythagoras used the term cosmos (Ancient Greek: κόσμος) for the order of the universe, but the term was not part of modern language until the 1 ... Read »


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    • Earth's location in the Universe


    • Gold universe

    • A Gold universe is a cosmological model of the universe. In these models, the universe starts with a Big Bang and expands for some time, with increasing entropy and a thermodynamic arrow of time pointing in the direction of the expansion. After the universe reaches a low-density state, it recontracts, but entropy now d ... Read »


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    • Graphical timeline from Big Bang to Heat Death

    • This is the timeline of the Universe from Big Bang to Heat Death scenario. The different eras of the universe are shown. The heat death will occur in 10103 years, if protons decay. Usually the logarithmic scale is used for such timelines but it compresses the most interesting Stelliferous Era too much as this example ... Read »


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    • Graphical timeline of the universe

    • This more than 20-billion-year timeline of our universe shows the best estimates of major events from the universe's beginning to anticipated future events. Zero on the scale is the present day. A large step on the scale is one billion years; a small step, one hundred million years. The past is denoted by a minus sign: ... Read »


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    • Graphical timeline of the Big Bang

    • This timeline of the Big Bang shows a sequence of events as currently theorized by scientists, but not yet completely proven. Dark Ages. It is a logarithmic scale that shows 10⋅log10{\displaystyle 10\cdot \log _{10}} second instead of second. For example, one microsecond is 10⋅log10⁡0.000001=10⋅(â ... Read »


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    • Graphical timeline of the Stelliferous Era

    • This is the timeline of the stelliferous era but also partly charts the primordial era, and charts more of the degenerate era of the heat death scenario. The scale is 10×log10⁡year{\displaystyle 10\times \log _{10}\mathrm {year} }. Example one million years is 10×log10⁡1000000=10×6=60{\displaystyle ... Read »


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    • Imago Universi

    • Andreas Cellarius, German mathematician and cartographer (1596–1665), conceived an Atlas of the Universe, published in 1660, under the title of Harmonia Macrocosmica. Numerous illustrations of the solar system appear in this atlas by different authors known at that time. Referring to Ptolemy, Cellarius called the ... Read »


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    • Lambda-CDM model

    • The ΛCDM (Lambda cold dark matter) or Lambda-CDM model is a parametrization of the Big Bang cosmological model in which the universe contains a cosmological constant, denoted by Lambda (Greek Λ), associated with dark energy, and cold dark matter (abbreviated CDM). It is frequently referred to as the standard mode ... Read »


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    • List of cosmological horizons

    • A cosmological horizon is a measure of the distance from which one could possibly retrieve information. This observable constraint is due to various properties of general relativity, the expanding universe, and the physics of Big Bang cosmology. Cosmological horizons set the size and scale of the observable universe. T ... Read »


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    • Observable universe

    • Observable universe

      The observable universe is a spherical region of the Universe comprising all matter that may be observed from Earth at the present time, because light and other signals from these objects have had time to reach Earth since the beginning of the cosmological expansion. There are at least two trillion galaxies in the obse ... Read »


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    • Particle horizon

    • The particle horizon (also called the cosmological horizon, the comoving horizon (in Dodelson's text), or the cosmic light horizon) is the maximum distance from which particles could have traveled to the observer in the age of the universe. Much like the concept of a terrestrial horizon, it represents the boundary betw ... Read »


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    • Three-torus model of the universe

    • The three-torus model of the universe, or informally doughnut theory of the universe, is a proposed model describing the shape of the universe as a three-dimensional torus. The name comes from the shape of a doughnut, whose surface has the topology of a two-dimensional torus. Alexi Starobinski and Yakov B. Zeldovi ... Read »


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    • Ylem

    • Ylem is a term that was used by George Gamow, Ralph Alpher, and their associates in the late 1940s for a hypothetical original substance or condensed state of matter, which became subatomic particles and elements as we understand them today. The term ylem was actually coined by Ralph Alpher. In modern understanding, t ... Read »


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    • Physical universe

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